【正文】 t her grip on my arm.A) loosenB) removeC) relieveD) dismiss49. He never arrives on time and my is that he feels the meetings are useless.A) preferenceB) conferenceC) inferenceD) reference50. Mrs. gmithwas so about everything that no servants could please her.A)speeificB) speeialC)preciseD)particular51. Last night he saw two dark enter the building,and then there was the explosion.A) featuresB) figuresC) sketchesD) images52. It is obvious that this new rule is applicable to everyone without A) exception B) exclusion C) modificationD) substitution53. His temper and personalky show that he can bee a soldier of the top A) circle B) rank C) categoryD) grade54. During the lecture, the speaker occasionally his point by relating his own experiences.A) illustratedB) hintedC) citedD)displayed55. Only those who can to lose their money should make highrisk investments.A) maintainB) sustairtC) endureD)afford56, He found the media attention intolerable and decided to go abroad.A) sufficientB) constantC) steadyD) plenty57. There has been a collision a number of cars on the main road to town.A) posingB) consistingC) involvingD) engaging58. elephants are difthrent from wild elephants in many aspects, including their tempers.A) CultivatedB) RegulatedC) CivilD) Tame59. Ten days ago the young man info~ed his boss of his intention to A) resign B) reject C) retreatD) replace60. As one of the world39。s daughter is pretty and ,and many girls envy her.A) slenderB) lightC) faintD) minor38. Tomorrow the mayor is to a group of Canadian businessmen on a tour of the city.A) coordinateB) cooperateC) acpanyD) associate39. I39。s calorie intake is more important than doing exercise.B) Even occasional exercise can help reduce weight.C) Weight reduction is impossible without exercise.D) One could lose ten pounds in a year39。s time, assuming no increase infood intake, you could lose ten pounds. By increasing the distance of your walks gradually andmaking other dietary adjustments, you may lose even more weight. 26. What is said about the average American in the passage?A) They tend to exaggerate the healthful effect of light beer.B) They usually ignore the effect of exercise on losing weight.C) They prefer light beer and lowcalorie bread to other drinks and food.D) They know the factors that play a positive role in keeping down body weight.27. Some people dislike exercise because A) they think it is physically exhaustingB) they find it hard to exercise while on a dietC) they don39。s, were primarily the result of leaded gasoline emissions originating in the United States. In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly. A study published recently in the journal Nature shows that airborne leaded gas emissionsfrom the United States were the leading contributor to the high concentration of lead in the snow in Greenland. The new study is a result of the continued research led by Dr. Charles Boutron, anexpert on the impact of heavy metals on the environment at the National Center for ScientificResearch in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic(北極的 ) snow were declining. In his new study, Dr. Boutron found the ratios of the different forms of lead in the leadedgasoline used in the United States were different from the ratios of European, Asian and Canadiangasolines and thus enabled scientists to differentiate ( 分區(qū)) the lead sources. The dominant leadratio found in Greenland snow matched that found in gasoline from the United States. In a study published in the journal Ambio, scientists found that lead levels in soil in the Northeastern United States had decreased markedly since the introduction of unleaded gasoline. Many scientists had believed that the lead would stay in soil and snow for a longer period. The authors of the Ambio study examined samples of the upper layers of soil taken from thesame sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 19